Table 3. Hysteresis and indentation depth values (M±SD) obtained at same ranges of applied loads before and after riboflavin/UV-A corneal cross-linking.

Hysteresis (pJ)
	Cornea 1 load range: 1.9±0.1 μN		Cornea 2 load range: 3.6±0.1 μN		Cornea 3 load range: 1.4±0.1 μN		Cornea 4 load range: 4.5±0.1 μN		Cornea 5 load range: 6.7±0.1 μN
Approach speed (μm/s)	Before treatment	After treatment *	Before treatment	After treatment *	Before treatment	After treatment *	Before treatment	After treatment *	Before treatment	After treatment *
1.7	0.29±0.05	0.17±0.03	0.35±0.07	0.30±0.04	0.26±0.02	0.21±0.01	1.26±0.03	0.82±0.01	2.40±0.69	1.88±0.02
3.5	0.35±0.02	0.21±0.02	0.49±0.03	0.36±0.06	0.30±0.03	0.25±0.01	1.53±0.02	0.99±0.02	2.36±0.04	1.78±0.03
8.2	0.42±0.03	0.28±0.04	0.66±0.03	0.53±0.02			1.47±0.02	1.16±0.01
12.3	0.47±0.02	0.34±0.03	0.81±0.04	0.66±0.01
Indentation depth (μm)
	Cornea 1 load range: 1.9±0.1 μN		Cornea 2 load range: 3.6±0.1 μN		Cornea 3 load range: 1.4±0.1 μN		Cornea 4 load range: 4.5±0.1 μN		Cornea 5 load range: 6.7±0.1 μN
Approach speed (μm/s)	Before treatment	After treatment	Before treatment	After treatment	Before treatment	After treatment	Before treatment	After treatment	Before treatment	After treatment
1.7	2.40±0.04	1.97±0.20	2.46±0.04	2.18±0.08	2,03±0.63	1.33±0.04	2.75±0.04	2.17±0.05	2.12±0.28	1.97±0.04
3.5	2.21±0.05	1.85±0.09	2.35±0.02	2.03±0.04	1.45±0.30	1.28±0.11	2.50±0.04	2.01±0.02	1.60±0.02	1.38±0.05
8.2	2.02±0.03	1.72±0.13	2.24±0.03	1.89±0.03			2.10±0.01	1.97±0.04
12.3	1.93±0.02	1.69±0.20	2.15±0.01	1.86±0.03

* Hysteresis values: P<0.05 between the pre- and post-treatment states